Dresden 2014 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 10: Multiferroics I (jointly with MA, DF, KR, TT)
DS 10.6: Vortrag
Dienstag, 1. April 2014, 10:45–11:00, BEY 118
Different routes for enhanced control of ferroelectric polarization by magnetic field — •I. Fina1,2, V. Skumryev3,4, D. O'Flynn5, G. Balakrishnan5, N. Dix2, J. M. Rebled2,6, P. Gemeiner7, X. Marti8, F. Peiró6, B. Dkhil7, F. Sánchez2, L. Fàbrega2, and J. Fontcuberta2 — 1Max Planck Institute of Microstructure Physics, Halle, Germany — 2Institut de Ciència de Materials de Barcelona, Catalonia, Spain — 3Institució Catalana de Recerca i Estudis Avançats (ICREA), Catalonia, Spain — 4Universitat Autònoma de Barcelona, Barcelona, Spain — 5University of Warwick, Coventry, United Kingdom — 6LENS - MIND/IN2UB, Barcelona, Spain — 7Propriétés et Modélisation des Solides, Paris, France — 8Faculty of Mathematics and Physics, Praha, The Czech Republic
I will focus on the direct magnetoelectric effect, control of polarization vector by magnetic field, in single-phase and composite multiferroic materials in thin film form.
In single-phase multiferroic materials, cycloidal magnet, we will see that strong coexistence of polar and non-polar regions allow large susceptibilities leading to a full control of the polarization vector by means of magnetic field [1]. In composite materials, ferromagnetic-ferroelectric heterostructures, the limiting factor is the substrate clamping effect. We will show that we can overcome this undesired effect, enhancing the presence of some small quantity of defects. These defects store the needed elastic energy, enhancing the magnetoelectric coupling, which result in huge effects near room temperature [2].
[1] I. Fina, et al., Phys. Rev. B 88, 100403(R) (2013). [2] I. Fina, et al., Nanoscale 5, 8037 (2013).